diff --git a/modules/openapi-generator/src/main/resources/elixir/connection.ex.mustache b/modules/openapi-generator/src/main/resources/elixir/connection.ex.mustache
index f51e2137e28..234db287ad1 100644
--- a/modules/openapi-generator/src/main/resources/elixir/connection.ex.mustache
+++ b/modules/openapi-generator/src/main/resources/elixir/connection.ex.mustache
@@ -284,7 +284,7 @@ defmodule {{moduleName}}.Connection do
   def authorization(token, scopes \\ @default_scopes)
 
   def authorization(token, _scopes) when is_binary(token) do
-    {Tesla.Middleware.Headers, ["authorization", token]}
+    {Tesla.Middleware.Headers, [{"authorization", token}]}
   end
 
   def authorization({module, function}, scopes) when is_atom(module) and is_atom(function) do
diff --git a/samples/client/petstore/elixir/lib/openapi_petstore/connection.ex b/samples/client/petstore/elixir/lib/openapi_petstore/connection.ex
index 969f62343cf..aaface57722 100644
--- a/samples/client/petstore/elixir/lib/openapi_petstore/connection.ex
+++ b/samples/client/petstore/elixir/lib/openapi_petstore/connection.ex
@@ -216,7 +216,7 @@ defmodule OpenapiPetstore.Connection do
   def authorization(token, scopes \\ @default_scopes)
 
   def authorization(token, _scopes) when is_binary(token) do
-    {Tesla.Middleware.Headers, ["authorization", token]}
+    {Tesla.Middleware.Headers, [{"authorization", token}]}
   end
 
   def authorization({module, function}, scopes) when is_atom(module) and is_atom(function) do